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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-55738] Enhance error messaging when index creation results in an existing index having the same name</title>
                <link>https://jira.mongodb.org/browse/SERVER-55738</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;For convenience, the helper method to create an index does not require that a user specify a name for the index. If a name is unspecified, one is generated in the driver by concatenating the names of the indexed fields and the sort order, e.g. an index on&lt;/p&gt;

{&quot;a&quot;: 1}
&lt;p&gt;will get a default name &quot;a_1&quot;.&lt;/p&gt;

&lt;p&gt;The shell method db.collection.createIndex appears to have identical behavior from my testing.&lt;/p&gt;

&lt;p&gt;This can present problems in cases where a user creates multiple indexes in a collection with the same key pattern, as the generated names clash. A user who does something like:&lt;/p&gt;


&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.foo.createIndex({a: &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;}, {collation: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&apos;de&apos;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;}) &lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;Will get an error back saying &quot;An existing index has the same name as the requested index&quot;. This is confusing as the user never specified a name for either index.&lt;/p&gt;

&lt;p&gt;We should enhance the error messaging when &quot;An existing index has the same name as the requested index&quot; error is generated to ensure users will better diagnose and triage the problem. Perhaps we can consider something like: &quot;when index names are not specified they are auto generated and can cause conflicts please refer to our documentation&quot;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1669663">SERVER-55738</key>
            <summary>Enhance error messaging when index creation results in an existing index having the same name</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="13201">Fixed</resolution>
                                        <assignee username="yuhong.zhang@mongodb.com">Yuhong Zhang</assignee>
                                    <reporter username="michael.gargiulo@mongodb.com">Michael Gargiulo</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Fri, 2 Apr 2021 13:00:25 +0000</created>
                <updated>Sun, 29 Oct 2023 21:55:27 +0000</updated>
                            <resolved>Tue, 20 Apr 2021 01:37:07 +0000</resolved>
                                                    <fixVersion>5.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="3725220" author="xgen-internal-githook" created="Mon, 19 Apr 2021 15:22:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Yuhong Zhang&apos;, &apos;email&apos;: &apos;danielzhangyh@gmail.com&apos;, &apos;username&apos;: &apos;YuhongZhang98&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55738&quot; title=&quot;Enhance error messaging when index creation results in an existing index having the same name&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-55738&quot;&gt;&lt;del&gt;SERVER-55738&lt;/del&gt;&lt;/a&gt; Enhance error messaging when index creation results in an existing index having the same name&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/85df0bf614fc6eb5286ef7c020f00d0ff0fb21d9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/85df0bf614fc6eb5286ef7c020f00d0ff0fb21d9&lt;/a&gt;&lt;/p&gt;</comment>
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